Originally Posted By: Joe Wood
Proverbs 17, 27-28:

27 The one who has knowledge uses words with restraint, and whoever has understanding is even-tempered.
28 Even fools are thought wise if they keep silent, and discerning if they hold their tongues.

Words of wisdom.
In the same vein,

"It took me just a very few years to learn how to talk
and the next 60 to learn how to shut up".